fix: unify logger names in kernel-hands, replace console.error in gateway-api

- Fix inconsistent 'KernelClient' logger name to 'KernelHands' in listApprovals
- Replace console.error with logger.error in gateway-api triggerHand
- No functional changes, only logging consistency improvements

desktop/src/lib/gateway-api.ts

@@ -385,7 +385,7 @@ export function installApiMethods(ClientClass: { prototype: GatewayClient }): vo
       }>(`/api/hands/${name}/activate`, params || {});
       return { runId: result.instance_id, status: result.status };
     } catch (err) {
-      console.error(`[GatewayClient] Hand trigger failed for ${name}:`, err);
+      logger.error(`Hand trigger failed for ${name}`, { error: err });
       throw err;
     }
   };

desktop/src/lib/kernel-hands.ts

@@ -163,7 +163,7 @@ export function installHandMethods(ClientClass: { prototype: KernelClient }): vo
       return { approvals };
     } catch (error) {
       const { createLogger } = await import('./logger');
-      createLogger('KernelClient').error('listApprovals error:', error);
+      createLogger('KernelHands').error('listApprovals error:', error);
       return { approvals: [] };
     }
   };